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노필성,김재웅 동아대학교 환경문제연구소 2003 硏究報告 Vol.25 No.2
The necessity of evaluating floor serviceability is due to the fact that, with the trend toward using lighter and more flexible construction materials, excess vibration can occur under normal human activity loads, resulting in human discomfort and sometimes, unsafe condition. The complexity of the exact floor vibration computations has prompted investigators to use simplified model such as beam, equivalent SDOF and so on. This paper prefers plate itself for vibration analysis rather than above and compare results with that of other studies and floor vibration criteria.
노필성,김재웅 동아대학교 환경문제연구소 2001 硏究報告 Vol.24 No.2
Recently, the seismic design of light secondary system attached to heavier primary structures is of wide engineering interest. For integrity and serviceability of the S system, response quanties such as relative displacement between P and S system and absolute acceleration of the S system should be controlled. In this paper, the seismic design method limiting the response of the secondary system to acceptable criteria as well as graphs for Rh4S response and simplified peak factor equation are proposed to be used at the design stage and their realizations are moved through examples.
盧泌成,金在雄 동아대학교 환경문제연구소 1997 硏究報告 Vol.20 No.1
For the control of building to external dynamic forces created by the wind or earthquake, many structural control method has been studied. Among those, a closed-loop feedback control algorithm is proposed for the control of a building using an active tuned mass damper. The passive-control device properties, including the stiffness and damping constants of the tuned mass damper and the gain coefficients of actuator, are derived by minimizing the displacement variance of the building. The results show that the control efficiency of the ATMD based on the velocity feedback depends on the passive-control-device properties assumed. Also, the ATMD with optimal passive properties using complete feedback results in further reduction in the structural displacement, the control force required is smaller using complete feedback.
노필성,김재웅,강병두,최민호 대한건축학회 1995 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.15 No.2
Dynamic vibration absorbers with one degree of freedom are generally applied to t3ie passive control of structural vibration. These absorbers are useful to control a single mode of vibration under harmonic excitation. In this paper, substructure-type dynamic vibration absorber consisting of dynamic absorbing structure and connecting spring and damper between the main structure and substructure is presented. Equations of motion of the system become equal to those of the two-degrees-of freedom system with two masses and three springs. Formulas for optimum design of the substructure-type dynamic vibration absorber are proposed by using the optimum design method of a dynamic absorber in two degrees of freedom, obtained by Den Hartog's method. Numerical calculations indicate take response of the main structure with optimal vibration absorbing system is considerably reduced.